package com.getan.boot.common.monitor;

import com.getan.boot.common.utils.Arith;
import com.getan.boot.common.utils.DateUtils;
import lombok.Data;

import java.lang.management.ManagementFactory;
import java.time.Duration;
import java.time.LocalDateTime;

/**
 * JVM相关信息
 *
 * @author Bruce.Gong
 * @since 1.0.0-SNAPSHOT
 */
@Data
public class Jvm {

    /**
     * 当前JVM占用的内存总数(M)
     */
    private double total;

    /**
     * JVM最大可用内存总数(M)
     */
    private double max;

    /**
     * JVM空闲内存(M)
     */
    private double free;

    /**
     * JDK版本
     */
    private String version;

    /**
     * JDK路径
     */
    private String home;

    public double getTotal() {
        return Arith.div(total, (1024 * 1024), 2);
    }

    public double getMax() {
        return Arith.div(max, (1024 * 1024), 2);
    }

    public double getFree() {
        return Arith.div(free, (1024 * 1024), 2);
    }

    public double getUsed() {
        return Arith.div(total - free, (1024 * 1024), 2);
    }

    public double getUsage() {
        return Arith.mul(Arith.div(total - free, total, 4), 100);
    }

    /**
     * 获取JDK名称
     */
    public String getName() {
        return ManagementFactory.getRuntimeMXBean().getVmName();
    }

    /**
     * JDK启动时间
     */
    public LocalDateTime getStartTime() {
        return DateUtils.toLocalDateTime(DateUtils.toInstant(ManagementFactory.getRuntimeMXBean().getStartTime()));
    }

    /**
     * JDK运行时间
     */
    public Duration getRunTime() {
        return DateUtils.between(DateUtils.now(), getStartTime());
    }

    /**
     * 运行参数
     */
    public String getInputArgs() {
        return ManagementFactory.getRuntimeMXBean().getInputArguments().toString();
    }

}
